Closed-Form Solutions for Minimizing Sum MSE in Multiuser Relay Networks
Closed-Form Solutions for Minimizing Sum MSE in Multiuser Relay Networks
复制标题
DOI：
10.1109/vtcspring.2013.6692476
复制
发表时间：
2013-06
期刊：
影响因子：
--
通讯作者：
Hussein Al-Shatri;Xiang Li;R. S. Ganesan;A. Klein;T. Weber
中科院分区：
文献类型：
--
作者：
Hussein Al-Shatri;Xiang Li;R. S. Ganesan;A. Klein;T. Weber
考虑了由使用多个单天线中继器进行通信的单天线源节点对组成的场景。假设在整个传输周期内为不变信道，利用两个后续时隙的传输方案被应用于该场景。在第一个时隙中，源节点同时向中继站和目的节点发送数据。源节点和中继器都在第二时隙中向目的节点重传。由于中继器不能对接收信号进行译码，因此采用了放大和前向中继器。通过利用源节点和目的节点之间的直接链路，每个目的节点观察到二维信号空间。在本文中，均方误差之和可以写成继电器增益和源节点和目的节点的部分时间滤波器的凸二次函数。此外，还得到了干扰迫零约束和总能量约束下最小均方误差和的闭合解。结果表明，在低信噪比和中等信噪比下，所提方案的性能均优于干扰对齐方案。
A scenario consisting of single antenna source- destination node pairs communicating using multiple single antenna relays is considered. A transmission scheme utilizing two subsequent time-slots assuming a time invariant channel throughout the transmission period is applied to this scenario. In the first time-slot, the source nodes transmit to both the relays and the destination nodes. Both the source nodes and the relays retransmit to the destination nodes in the second time-slot. As the relays can not decode the received signals, amplify and forward relaying is used. By exploiting the direct links between the source and the destination nodes, each destination node observes a two dimensional signal space. In the present paper, the sum mean square error can be written as a convex quadratic function of the relays' gain and part of the temporal filters at the source and the destination nodes. Moreover, closed form solutions for the minimum sum mean square error with interference zero forcing constraints and a total energy constraint are obtained. The results show that the proposed schemes outperform the interference alignment scheme at low and moderate SNRs.